US6466166B2 - Multi-beam receiving apparatus - Google Patents

Multi-beam receiving apparatus Download PDF

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Publication number
US6466166B2
US6466166B2 US09/867,635 US86763501A US6466166B2 US 6466166 B2 US6466166 B2 US 6466166B2 US 86763501 A US86763501 A US 86763501A US 6466166 B2 US6466166 B2 US 6466166B2
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outputs
output
radio receiving
demodulation
correlation
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US20010048389A1 (en
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Takashi Nakagawa
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NEC Corp
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NEC Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7113—Determination of path profile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Definitions

  • the present invention relates to a base station in a mobile communication system using a direct spread CDMA (Code Division Multiple Access) and, more particularly, to a multi-beam receiving apparatus in the base station, which receives a radio signal from a mobile station.
  • CDMA Code Division Multiple Access
  • FIG. 7 shows a sector receiving apparatus for receiving a radio signal corresponding to one user in the base station of a CDMA mobile communication system using a conventional sector antenna.
  • a radio signal of one sector corresponding to one user normally, diversity reception using two antennas 501 1 and 501 2 is performed.
  • Signals received by the antennas 501 1 and 501 2 are frequency-converted into intermediate frequencies by radio receiving sections 502 1 and 502 2 , respectively, and then, subjected to automatic gain amplification.
  • the amplified reception signals are further detected to the baseband signals of I/Q channels by the radio receiving sections 502 1 and 502 2 using quadrature detection and then converted into digital signals by an A/D converter.
  • the outputs from the radio receiving sections 502 1 and 502 2 are sent to a searcher section 500 and finger section 510 .
  • the code correlation values of desired wave signals contained in the reception signals are calculated by correlators 503 1 and 503 2 , and delay profiles are generated by delay profile estimation sections 504 1 and 504 2 on the basis of the calculation results.
  • a path detection circuit 505 detects the reception timings of the multipath signals from the generated delay profiles (the maximum number of detected paths equals the number of demodulators 511 in the finger section 510 ) and notifies the finger section 510 of the detected reception timings as a reception timing notification signal E.
  • the finger section 510 despreads the signals from the radio receiving sections 502 1 and 502 2 using the reception timing notification signal E and antenna number notification signal F output from the path detection circuit 505 . That is, an antenna is selected in accordance with the antenna number notification signal F, and each path is despread at a timing notified by the reception timing notification signal E.
  • the despread signals are synthesized by a maximum ratio synthesizer 512 and sent to a decoding circuit 520 .
  • a sector antenna is dedicated to one of a plurality of sectors obtained by dividing the periphery (cell) of 360°.
  • a cell is divided into sectors, any interference waves that arrive from mobile stations outside a sector can be removed, and interference with the mobile stations outside the sector can be reduced.
  • an arriving wave from a mobile station 602 of a certain user in a single sector becomes an interference wave for the desired wave of another mobile station 601 , as shown in FIG. 8 .
  • Such an interference wave decreases the radio channel capacity and also degrades the transmission quality.
  • a multi-beam receiving apparatus comprising a plurality of antenna elements, a plurality of radio receiving means for receiving radio signals through the antenna elements, respectively, a plurality of correlation means for calculating code correlation values of desired wave signals contained in reception signals output from the radio receiving means, a plurality of first beam formation means for individually forming beams on the basis of all outputs from the correlation means, a plurality of delay profile means for individually generating delay profiles on the basis of outputs from the first beam formation means, detection means for detecting, on the basis of outputs from the delay profile means, a reception timing of a multipath formed from the beams formed by the first beam formation means, a plurality of demodulation means for demodulating all the reception signals output from the radio receiving means at the reception timing detected by the detection means, a plurality of second beam formation means for individually forming beams on the basis of all demodulation outputs from the demodulation means, synthesis means for synthesizing outputs from the second beam
  • FIG. 1 is a block diagram of a multi-beam receiving apparatus according to the first embodiment of the present invention
  • FIG. 2 is a block diagram of a beam formation device shown in FIG. 1;
  • FIG. 3 is a graph showing the characteristics of beams received by the multi-beam receiving apparatus
  • FIG. 4 is a block diagram of a multi-beam receiving apparatus according to the second embodiment of the present invention.
  • FIG. 5 is a view showing the beam reception situation in the multi-beam receiving apparatus
  • FIG. 6 is a block diagram of a radio receiving section shown in FIG. 1;
  • FIG. 7 is a block diagram of a conventional multi-beam receiving apparatus.
  • FIG. 8 is a view showing the beam reception situation in the conventional multi-beam receiving apparatus.
  • FIG. 1 shows a multi-beam receiving apparatus according to the first embodiment of the present invention.
  • the multi-beam receiving apparatus of this embodiment is the receiving apparatus of a mobile communication system using the direct spread CDMA scheme and implements a multi-beam system which forms a plurality of beams using an array antenna having a plurality of antenna elements.
  • FIG. 1 shows the receiving apparatus of a fixed multi-beam system for generating four beams.
  • the multi-beam receiving apparatus of this embodiment comprises n antenna elements 101 1 to 101 n , radio receiving sections 102 1 to 102 n for converting RF (Radio Frequency) signals received by the antenna elements 101 1 to 101 n into digital baseband signals, a searcher section 100 for detecting the position (timing) of a path for each beam, a finger section 110 for performing despreading at the timing detected by the searcher section 100 and then performing maximum ratio synthesis, and a beam weight control section 114 for setting a predetermined beam weight (complex weight) for each signal.
  • RF Radio Frequency
  • the searcher section 100 comprises n correlators 103 1 to 103 n for receiving the outputs from the radio receiving sections 102 1 to 102 n , respectively, beam formation devices 104 1 to 104 4 arranged in number equal to that of beams (four beams) to be generated, delay profile estimation sections 105 1 to 105 4 for receiving the outputs from the beam formation devices 104 1 to 104 4 , respectively, and a path detection circuit 106 for receiving the outputs from the delay profile estimation sections 105 1 to 105 4 and outputting a reception timing notification signal A and beam number notification signal B to the finger section 110 .
  • the finger section 110 comprises demodulators 111 1 to 111 4 which are provided in number equal to that of beams and commonly receive all the outputs from the radio receiving sections 102 1 to 102 n , beam formation devices 112 1 to 112 4 for receiving the outputs from the demodulators 111 1 to 111 4 , and a maximum ratio synthesizer 113 for receiving the outputs from the beam formation devices 112 1 to 112 4 and outputting a maximum ratio synthesis signal to a decoding circuit 120 .
  • the reception timing notification signal A and beam number notification signal B are input to the demodulators 111 1 to 111 4 and beam formation devices 112 1 to 112 4 .
  • the beam formation devices 104 1 to 104 4 and 112 1 to 112 4 are added to the searcher section and finger section of the conventional receiving apparatus shown in FIG. 7, and the beam weight control section 114 for setting a beam weight for each beam formation device is commonly provided for the beam formation devices 104 1 to 104 4 of the searcher section 100 and the beam formation devices 112 1 to 112 4 of the finger section 110 .
  • the beam formation devices 104 1 to 104 4 of the searcher section 100 are provided in number equal to that of beams to be generated, and each of the beam formation devices 104 1 to 104 4 receives the correlation values of input signals from all the antenna elements 101 1 to 101 n .
  • the beam formation devices 112 1 to 112 4 of the finger section 110 are provided in number equal to that of demodulators 111 1 to 111 4 , and the outputs from the demodulators 111 1 to 111 4 are input to the beam formation devices 112 1 to 112 4 , respectively.
  • Each beam formation devices 104 1 to 104 4 and 112 1 to 112 4 generates a beam by multiplying the input I/Q correlation value by a beam weight set by the beam weight control section 114 .
  • FIG. 2 shows the arrangement of each of the beam formation devices 104 1 to 104 4 and 112 1 to 112 4 included in the searcher section 100 and finger section 110 .
  • Each beam formation device comprises (4 ⁇ n) multipliers 201 a and 201 b , (2 ⁇ n) adders 202 , and two accumulators 203 for adding and synthesizing n I/Q outputs in order to calculate a complex product sum for the n antenna elements.
  • RF signals received by the antenna elements 101 1 to 101 n are sent to the corresponding radio receiving sections 102 1 to 102 n , respectively.
  • the received RF signal is frequency-converted into an intermediate frequency by a frequency conversion section 11 and the intermediate frequency signal is amplified by an automatic gain amplifier 12 .
  • the signal is detected to the baseband signal of an I/Q channel by an orthogonal detector 13 using quadrature detection, converted into a digital signal by an A/D converter 14 , and output.
  • the outputs from the radio receiving sections 102 1 to 102 n are sent to the searcher section 100 and finger section 110 .
  • the correlators 103 1 to 103 n of the searcher section 100 calculate the code correlation values of desired wave signals contained in the reception signals and output the code correlation values.
  • the n outputs from the correlators 103 1 to 103 n are commonly sent to the beam formation devices 104 1 to 104 4 .
  • the values are weighted by beam weight.
  • the beam weight for each of the beam formation devices 104 1 to 104 4 is preset by the beam weight control section 114 .
  • FIG. 2 shows details of each of the beam formation devices 104 1 to 104 4 of the searcher section.
  • each of the beam formation devices 104 1 to 104 4 comprises a pair of first multipliers 201 a for multiplying the I/Q signal input for each antenna by a beam weight I(m,n), a pair of second multipliers 201 b for multiplying the I/Q signal input for each antenna by a beam weight Q(m,n), a pair of adders 202 for adding the I/Q outputs from the first multipliers 201 a and the Q/I outputs from the second multipliers 201 b , and a pair of accumulators 203 for adding and synthesizing the I/Q outputs from the adders 202 for the respective antenna elements.
  • each of the beam formation devices 104 to 104 1 having the above arrangement, arithmetic operations are performed using the multipliers 201 a and 201 b and the adders 202 between a beam weight w(m,n) including the beam weights I/Q(m,n) and the code correlation values of the desired wave signals (I/Q) received by the antenna elements 101 1 to 101 n and calculated for the correlators 103 1 to 103 n .
  • the obtained calculation results for the antenna elements 101 1 to 101 n are output to the accumulators 203 and added and synthesized.
  • the beam weight w(m,n) is given by
  • n is the antenna element number
  • s is the number of beams
  • t is the number of antenna elements.
  • equation (1) can be rewritten to
  • the phase between the outputs from the antenna elements 101 1 to 101 n is corrected.
  • Each of the beam formation devices 104 1 to 104 4 of the searcher section 100 generates one beam in accordance with the I/Q output and outputs the generated beam to a corresponding one of the delay profile estimation sections 105 1 to 105 4 .
  • FIG. 3 shows the beam patterns of four beams individually output from the beam formation devices 104 1 to 104 4 of the searcher section 100 .
  • beams a to d are output from the beam formation devices 104 1 to 104 4 .
  • the delay profile estimation sections 105 1 to 105 4 On the basis of the beams a to d output from the beam formation devices 104 1 to 104 4 of the searcher section 100 , the delay profile estimation sections 105 1 to 105 4 generate delay profiles and output the profiles to the path detection circuit 106 .
  • the path detection circuit 106 detects an effective path from the delay profiles of the respective beams and sends to the finger section 110 the reception timing notification signal A and beam number notification signal B, which represent the timing and beam number.
  • the finger section 110 has the plurality of demodulators 111 1 to 111 4 , and one demodulator is assigned to one path (reception timing).
  • One demodulator receives all the digital baseband signals from the antenna elements 101 1 to 101 n and demodulates the digital baseband signals at the timing indicated by the reception timing notification signal A.
  • the outputs from the demodulators 111 1 to 111 4 are output to the beam formation devices 112 1 to 112 4 , multiplied by beam weights by the beam formation devices 112 1 to 112 4 , and added and synthesized.
  • the beam formation devices 112 1 to 112 4 of the finger section 110 have the same arrangement as that of the beam formation devices 104 1 to 104 4 of the searcher section 100 shown in FIG. 2 .
  • a beam weight to be multiplied a value calculated using equation (1) in accordance with the beam number of the path notified by the path detection circuit 106 is obtained from the beam weight control section 114 .
  • the signals obtained by addition and synthesis by the beam formation devices 112 1 to 112 4 are sent to the maximum ratio synthesizer 113 .
  • the maximum ratio synthesizer 113 weights the output signals from the beam formation devices 112 1 to 112 4 on the basis of a preset degree of confidence.
  • the weighted output signals are synthesized and output to the decoding circuit 120 .
  • the conventional sector is divided into the plurality of beams a, b, c, and d as shown in FIG. 5, and the respective beams are weighted such that the peak position of a certain beam has the null points of the remaining beams, as shown in FIG. 3 . That is, referring to FIG.
  • null points o of the beams b, c, and d are located at a peak position a 1 of the beam a
  • null points r of the beams a, c, and d are located at a peak position b 1 of the beam b
  • null points p of the beams a, b, and d are located at a peak position c 1 of the beam c
  • null points q of the beams a, b, and c are located at a peak position d 1 of the beam d.
  • the beams need not be adaptively controlled.
  • the beam weight set by the beam weight control section 114 is originally a constant.
  • the variation amounts containing phase variations and amplitude variations in the respective radio receiving sections individually differ due to the element delay characteristic and amplitude characteristic of the amplifier and filter as the components of the radio receiving section or change due to a variation in temperature or degradation over time.
  • the beam weight calculated from equation (1) is merely used as a constant, the beam pattern generated by the beam formation device may be different from the expected beam pattern.
  • FIG. 4 shows a multi-beam receiving apparatus according to the second embodiment of the present invention.
  • a calibration device 115 for sending to radio receiving sections 102 1 to 102 n a calibration signal substantially in the same frequency band as that of a spread signal used for spectrum spread communication is added to the first embodiment shown in FIG. 1 .
  • the calibration device 115 transmits a calibration signal D to all the radio receiving sections 102 1 to 102 n , extracts the outputs from the radio receiving sections 102 1 to 102 n , and compares the outputs.
  • the calibration device 115 calculates a calibration coefficient C for each of antenna elements 101 1 to 101 n in accordance with the comparison result and notifies a beam weight control section 114 of the calculated calibration coefficient C at a predetermined period (calibration cycle).
  • the beam weight control section 114 multiplies a complex weight calculated by equation (1) by the calibration coefficient C received from the calibration device 115 to update the beam weight.
  • the calibration coefficient is a correction value for correcting the variation in variation amount of the radio receiving sections 102 1 to 102 n corresponding to the antenna elements 101 1 to 101 n and a complex value containing phase information and amplitude information.
  • the beam weights are updated every calibration cycle using the calibration coefficient C that is calculated by the calibration device 115 for the radio receiving sections 102 1 to 102 n . Consequently, the variation between the radio receiving sections 102 1 to 102 n is compensated simultaneously with beam formation, so a desired beam can be accurately output.
  • one sector of a cell can be divided into a plurality of beams and communicated.
  • interference from another user with the communication signal of each beam can be reduced.
  • the multi-beam receiving apparatus of the present invention is applied to the base station of a mobile communication system, interference from another mobile station can be eliminated without dividing a cell into a larger number of sectors, and any increase in the number of times of hand-over between the sectors can be suppressed.
  • a system having a higher quality and larger capacity can be implemented without decreasing the radio channel capacity or increasing the scale and cost.
  • the beam weight is updated on the basis of a calibration coefficient calculated at a predetermined period. For this reason, even when the variation amount of each radio receiving section varies, the variation can be compensated, and a desired beam can be accurately formed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
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JP2000166036A JP3424659B2 (ja) 2000-06-02 2000-06-02 マルチビーム受信装置
JP2000-166036 2000-06-02
JP166036/2000 2000-06-02

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EP1161001A2 (fr) 2001-12-05
JP2001345747A (ja) 2001-12-14
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US20010048389A1 (en) 2001-12-06
JP3424659B2 (ja) 2003-07-07
CN1327317A (zh) 2001-12-19
BR0102966A (pt) 2002-02-13

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